Original Articles

The optimization of nitrogen and phosphorus application to cultivated Digitaria eriantha ssp. eriantha pasture

Published in: South African Journal of Plant and Soil
Volume 5, issue 1, 1988 , pages: 11–14
DOI: 10.1080/02571862.1988.10634240
Author(s): P.J. van RooyenDirectorate of Biometric and Datametric Services, Department of Agriculture and Water Affairs, Republic of South Africa, C.S. DannhauserHighveld Region, Department of Agriculture and Water Affairs, Republic of South Africa

Abstract

A production function is derived and calibrated for Digitaria eriantha hay production in the Highveld region of the RSA. A procedure is described that optimizes this function for nitrogen and phosphorus application rates within economic and risk constraints at different expected rainfall levels. Risk analysis points to more definite optimal rates than classical optimization alone. It was also found that experiments with all treatments near the optimum, or production functions without definite yield limits, could lead to recommendation of too high application rates.

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